The plan all along is for you to save up enough money to be on your own.
In your past posts, you have written a lot about how controlling and unfair she is, you feel she has no right to say this or that, etc.
Living in the same house has not been easy on any of you. I think the fact of the matter is that the time for you to move is fast approaching and in spite of everything, she is still worried about you. I don't think it's a control thing as much as it being harder to help you if you are farther away. The reality is that you have had to live in her house, you have had to borrow money from her. You're moving far away with a grandchild that I'm certain she adores as well as her son. It would be impossible for her not to worry.
As far as insurance for your daughter, do you have a plan for that? If you do, you could just let her know that you have it covered instead of giving her a DUH attitude.
I could be reading this wrong, but it sounds like you are taking your daughter and moving away and your husband will join you AFTER you find a job. I don't know how much money you have saved, but in this economy, it could all be gone just keeping a roof over your heads while you look for work.
I thought your plan was to save money to get a house for you and your husband and daughter. Like I said, I could be mistaken, and you've needed to have a place of your own for a long time, but is this the wisest way to go about it? Does your husband have a job waiting for him in Washington?
Your plan is your plan and your business so I'm not trying to offend you, I'm just saying that even though you think your MIL is a hard hearted you-know-what, maybe she really is genuinely concerned as opposed to feeling a loss of "control" over you.
I have a 25 year old daughter with a baby who will be 1 in May. She has been on her own since 18, but if she told me she was moving to another state without having a job, etc, I would be worried out of my mind. Frankly, I would want to know what her back-up plan was going to be.
If you have a solid plan, go for it! Make it work.
Just realize that the people who have helped you all this time will have concerns. I think it's pretty normal.
You don't have to mistake concern for bitterness.
You don't have to say, "No matter how bad things get, I will NEVER come back here".
Those aren't good terms to leave on. Especially with your husband staying behind.
Just my opinion.
******I'm glad you have family where you're going. That certainly makes a difference.
This move WILL be stressful for you. Lord knows, I hate moving more than anything in this world.
You've counted the days. You know where you're going. You have family to help you on the other end. There is light at the end of the tunnel.
Just focus on your goals and if your mother in law gets wonky, just go to that happy place in your mind where you can envision all the things you've planned and saved for coming to fruition. You're so close now.
Best wishes.